Incandescent-electric-lamp socket



N. W. NUTT.

INCANDESCENT ELECTRIC LAMP SOCKET.

APPLICATION FILED AUG-1.1919.

Patented Jan. 25, 1921.

PATENT OFFICE.

NORMAN W. NUTT, OF TRENTON, NEW JERSEY.

INCANDESCENT-ELECTRIC-LAMP SOCKET.

Specification of Letters Patent.

Patented Jan. 25, 1921.

Application filed August 1, 1919., Serial No. 314,694.

To all whom it may concern Be it known that I, NORMAN W. NUTT,

a vertical diametrical section of my device taken on the line 11 in Fig. 3; Fig. 2 shows a similar section taken on the line 2*-2 in Fig. 3; Fig. 3 is a top view of my socket with the metal cap removed; and Fig. 4 is a view of the under. side of the metal cap, showing the insulating lining thereof and the means for fastening it to the cap.

The body, a, of my socket is made preferably of porcelain. Its upper face is recessed slightly within a marginal. circular bead, I), and has die-formed depressions, c

and d, to receive the binding screws and plates e and 7, respectively. Through a central opening in the body a is passed the screw g, which electrically connects the plate of the binding screw 6 with the central spring lamprcontact h. The metal screwsocket, 2', adapted to receivethe threaded base of a lamp, is open at both ends, save for the flanges, is, is, at its upper or inner end. Said flanges are pierced to receive the screws 1 and m, respectively. Passing through the body a, the screw Z establishes electrical connection between the plate of the'binding screw f and the screw-socket 11 and aids in holding the screw-socket to the body a. The screw m is screwed into a small metal plate olying in a recess in the upper; face of the body a and aids in holding the screw-socket c' to its place in the body a. I

The cap, 77, of the socket is of metal, having centrally located therein an aperture of oval form (indicated by dotted lines in Fig. 4) to receive the annular internally-thread ed nipple, g, adapted'to connect with the current-wire conduit, bracket or fixture. The nipple g is entered ,tothe oval aperture in the cap 19 and is'swaged therein into conformity with said oval aperture, a firm union of the two elementsbeing thus effected. Upon the inner face of the cap 19 is fixed a flat insulating member, 9, of flexible material, having a central aperturev of less diameter than the diameter of the nipple g for the passage therethrough of the current wires. This insulating member is attached firmly to the cap p by eyelets, s, s, which are passed through small circular openings in the cap and insulating member and are clamped thereon. The cap p is also pierced at t, t to receive the screws u, u which pass through openings in the body a, and hold the cap thereto.

By the described construction I produce a unitary body or insulating base for the socket, reduce the metal parts to the smallest practicable number and sizes, and provide ample security against short-circuiting in a simple structure which is readily assembled.

Having thus described my invention, I claim 1. An incandescent electric lamp socket having a unitary body portion of insulating material containing a metal screw-socket to receive the base of a lamp, and conducting means, including a central lamp contact, the upper face of said socketprovided with an upstanding marginal flange forming a recess, in combination with a metal cap having an oval aperture therein and an annular threaded nipple swaged into said aperture adapted to seat on said flange; and insu-' lated means interposed between said metal cap and said unitary body, said insulating means being clamped between the cap and body in said recess.

2. An incandescent electric lamp socket having a unitary body of insulating material, the upper face of said body being provided with an upstanding marginal flange forming a recess, and a metal cap secured to said unitary body, said metal cap having a threaded nipple and a fiat sheet of insulating material attached to the inner face of the cap by eyelets clamping it thereto, and covering the exposed portion. of said cap and the inner end of said nipple, said cap resting on the marginal flange and the insulating material seated within said recess.

3. An incandescent electric lamp socket having a unitary body of insulating material recessed at one end to receive ,a screwsocket for a lamp and at the other end having separated recesses to receive bindingscrews and plates and the current-wires connected therewith, in combination with an insulated metal cap having a central aperture therein and a threaded nipple swaged therein, screws passing through the upper portion of said body and holding said metal cap thereto, a screw connecting one of said binding-screws and its plate with said lamp latter screws passing through the partition 15 formed between the upper and lower recesses of said body.

NORMAN W.- NUTT.

Witnesses C. A. MALLoY, JOHN R. D. BOWER. 

